30% at 500 with that much wind is very respectable. My best dog gun has been a 224 clarck with a k&p barrel on a rem 700 action. Clocked my hand swaged 60 grainers at 4260. A little hot, every once in a while my bullets would come appart, one in every 60 more or less. With 30 mile per hour wind it was fairly simple to conect at up to 400 with dogs, the rifle was not a 1/4 inch rifle at 100, maybe 3/4 at a 100 but the speed made it great for long distances. Very little drop too. I have put more than 3000 rounds through it with the same barrel, brass has to be anealed every 3 to extend life, and it will hold up to 6 to 8 loadings.